attributes: fix #[instrument(err)] with impl Trait return types
#1236
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…1233) ## Motivation Currently, using `#[instrument(err)]` on a function returning a `Result` with an `impl Trait` in it results in a compiler error. This is because we generate a type annotation on the closure in the function body that contains the user function's actual body, and `impl Trait` isn't allowed on types in local bindings, only on function parameters and return types. ## Solution This branch fixes the issue by simply removing the return type annotation from the closure. I've also added tests that break on master for functions returning `impl Trait`, both with and without the `err` argument. Fixes #1227 Signed-off-by: Eliza Weisman <eliza@buoyant.io>
Signed-off-by: Eliza Weisman <eliza@buoyant.io>
hawkw
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Fixed - **attributes**: Compiler error when using `#[instrument(err)]` on functions which return `impl Trait` ([#1236]) - Fixed broken match arms in event macros ([#1239]) - Documentation improvements ([#1232]) Thanks to @bkchr and @lfranke for contributing to this release! [#1236]: #1236 [#1239]: #1239 [#1232]: #1232 Signed-off-by: Eliza Weisman <eliza@buoyant.io>
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### Fixed - **attributes**: Compiler error when using `#[instrument(err)]` on functions which return `impl Trait` ([#1236]) - Fixed broken match arms in event macros ([#1239]) - Documentation improvements ([#1232]) Thanks to @bkchr and @lfranke for contributing to this release! [#1236]: #1236 [#1239]: #1239 [#1232]: #1232 Signed-off-by: Eliza Weisman <eliza@buoyant.io>
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### Fixed - Compiler error when using `#[instrument(err)]` on functions which return `impl Trait` ([tokio-rs#1236]) [tokio-rs#1236]: tokio-rs#1236 Signed-off-by: Eliza Weisman <eliza@buoyant.io>
kaffarell
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### Fixed - **attributes**: Compiler error when using `#[instrument(err)]` on functions which return `impl Trait` ([tokio-rs#1236]) - Fixed broken match arms in event macros ([tokio-rs#1239]) - Documentation improvements ([tokio-rs#1232]) Thanks to @bkchr and @lfranke for contributing to this release! [tokio-rs#1236]: tokio-rs#1236 [tokio-rs#1239]: tokio-rs#1239 [tokio-rs#1232]: tokio-rs#1232 Signed-off-by: Eliza Weisman <eliza@buoyant.io>
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This backports PR #1233 to v0.1.x. This isn't just a simple cherry-pick
because the new tests in that branch use the v0.2.x module names, so
that had to be fixed. Otherwise, though, it's the same change, and I'll go
ahead and merge it when CI passes, since it was approved on
master.Motivation
Currently, using
#[instrument(err)]on a function returning aResultwith an
impl Traitin it results in a compiler error. This is becausewe generate a type annotation on the closure in the function body that
contains the user function's actual body, and
impl Traitisn't allowedon types in local bindings, only on function parameters and return
types.
Solution
This branch fixes the issue by simply removing the return type
annotation from the closure. I've also added tests that break on master
for functions returning
impl Trait, both with and without theerrargument.
Fixes #1227
Signed-off-by: Eliza Weisman eliza@buoyant.io